diff options
Diffstat (limited to 'shell/emu/core.c')
| -rw-r--r-- | shell/emu/core.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/shell/emu/core.c b/shell/emu/core.c new file mode 100644 index 0000000..99759a6 --- /dev/null +++ b/shell/emu/core.c @@ -0,0 +1,358 @@ +// Author: skogaby +// Lots of examples were followed using other emulators found on github + +#include <SDL/SDL.h> +#include <libgen.h> +#include <sys/time.h> +#include <sys/types.h> + +#include "main.h" +#include "snes9x.h" +#include "soundux.h" +#include "memmap.h" +#include "apu.h" +#ifdef USE_BLARGG_APU +#include "apu_blargg.h" +#endif +#include "cheats.h" +#include "display.h" +#include "gfx.h" +#include "cpuexec.h" +#ifdef USE_SPC7110 +#include "spc7110.h" +#endif +#include "srtc.h" +#include "sa1.h" +#include "snapshot.h" +#include "scaler.h" + +#include "shared.h" +#include "menu.h" +#include "video_blit.h" +#include "input.h" +#include "sound_output.h" + +char GameName_emu[512]; + +bool overclock_cycles = false; +bool reduce_sprite_flicker = true; +int one_c, slow_one_c, two_c; + +static int32_t samples_to_play = 0; +static int32_t samples_per_frame = 0; +static int32_t samplerate = (((SNES_CLOCK_SPEED * 6) / (32 * ONE_APU_CYCLE))); + +#ifdef USE_BLARGG_APU +static void S9xAudioCallback() +{ + size_t avail; + /* Just pick a big buffer. We won't use it all. */ + static int16_t audio_buf[0x20000]; + + S9xFinalizeSamples(); + avail = S9xGetSampleCount(); + S9xMixSamples(audio_buf, avail); + Audio_Write(audio_buf, avail >> 1); +} +#endif + +bool8 S9xInitUpdate() { return TRUE; } +bool8 S9xDeinitUpdate(int width, int height, bool8_32 sixteen_bit) +{ + if (IPPU.RenderThisFrame) { + Update_Video_Ingame(width, height); + } +} + +void SRAM_Save(char* path, uint_fast8_t state) +{ + FILE* savefp; + + /* If SRAM is not used then don't bother saving any SRAM file */ + if (CPU.Memory_SRAMMask == 0) return; + + if (state == 1) + { + savefp = fopen(path, "rb"); + if (savefp) + { + fread(Memory.SRAM, sizeof(uint8_t), CPU.Memory_SRAMMask, savefp); + fclose(savefp); + } + } + else + { + savefp = fopen(path, "wb"); + if (savefp) + { + fwrite(Memory.SRAM, sizeof(uint8_t), CPU.Memory_SRAMMask, savefp); + fclose(savefp); + } + } +} + +void SaveState(char* path, uint_fast8_t state) +{ + if (state == 1) + { + S9xUnfreezeGame(path); + } + else + { + S9xFreezeGame(path); + } +} + + +#ifdef FRAMESKIP +static uint32_t Timer_Read(void) +{ + /* Timing. */ + struct timeval tval; + gettimeofday(&tval, 0); + return (((tval.tv_sec*1000000) + (tval.tv_usec))); +} +static long lastTick = 0, newTick; +static uint32_t SkipCnt = 0, video_frames = 0, FPS = 60, FrameSkip; +static const uint32_t TblSkip[4][4] = { + {0, 0, 0, 0}, + {0, 0, 0, 1}, + {0, 0, 1, 1}, + {0, 1, 1, 1} +}; +#endif + +#ifdef AUDIO_FRAMESKIP +#define MAX_SKIP_COUNT 3 +static uint32_t SkipCnt = 0; +#endif + +void Emulation_Run (void) +{ +#ifndef USE_BLARGG_APU + static int16_t audio_buf[2048]; +#endif + +#ifdef FRAMESKIP + SkipCnt++; + if (SkipCnt > 3) SkipCnt = 0; + if (TblSkip[FrameSkip][SkipCnt]) IPPU.RenderThisFrame = false; + else IPPU.RenderThisFrame = true; +#else + IPPU.RenderThisFrame = true; +#endif + +#ifdef USE_BLARGG_APU + S9xSetSoundMute(false); +#endif + //Settings.HardDisableAudio = false; + +#ifdef AUDIO_FRAMESKIP + if (IPPU.RenderThisFrame) { + if (Audio_Underrun_Likely()) { + if (SkipCnt < MAX_SKIP_COUNT) { + SkipCnt++; + IPPU.RenderThisFrame = false; + } else { + SkipCnt = 0; + } + } + } else { + SkipCnt = 0; + } +#endif + + S9xMainLoop(); + +#ifndef USE_BLARGG_APU + samples_to_play += samples_per_frame; + + if (samples_to_play > 512) + { + S9xMixSamples(audio_buf, samples_to_play); + Audio_Write(audio_buf, samples_to_play / 2); + samples_to_play = 0; + } +#else + S9xAudioCallback(); +#endif + +#ifdef FRAMESKIP + video_frames++; + newTick = Timer_Read(); + if ( (newTick) - (lastTick) > 1000000) + { + FPS = video_frames; + video_frames = 0; + lastTick = newTick; + if (FPS >= 60) + { + FrameSkip = 0; + } + else + { + FrameSkip = 60 / FPS; + if (FrameSkip > 3) FrameSkip = 3; + } + } +#endif +} + + +bool Load_Game_Memory(char* game_path) +{ + uint64_t fps; + CPU.Flags = 0; + + if (!LoadROM(game_path)) + return false; + + Settings.FrameTime = (Settings.PAL ? Settings.FrameTimePAL : Settings.FrameTimeNTSC); + + if (!Settings.PAL) + fps = (SNES_CLOCK_SPEED * 6.0 / (SNES_CYCLES_PER_SCANLINE * SNES_MAX_NTSC_VCOUNTER)); + else + fps = (SNES_CLOCK_SPEED * 6.0 / (SNES_CYCLES_PER_SCANLINE * SNES_MAX_PAL_VCOUNTER)); + + samplerate = SOUND_OUTPUT_FREQUENCY; + Settings.SoundPlaybackRate = samplerate; + +#ifndef USE_BLARGG_APU + Settings.SixteenBitSound = true; + so.stereo = Settings.Stereo; + so.playback_rate = Settings.SoundPlaybackRate; + S9xSetPlaybackRate(so.playback_rate); + + samples_per_frame = samplerate / fps << 1; +#endif + return true; +} + + +void init_sfc_setting(void) +{ + memset(&Settings, 0, sizeof(Settings)); + Settings.JoystickEnabled = false; + Settings.SoundPlaybackRate = samplerate; + Settings.Stereo = true; + Settings.SoundBufferSize = 0; + Settings.CyclesPercentage = 100; + + Settings.DisableSoundEcho = false; + Settings.InterpolatedSound = true; + Settings.APUEnabled = true; + + Settings.H_Max = SNES_CYCLES_PER_SCANLINE; + Settings.SkipFrames = AUTO_FRAMERATE; + Settings.FrameTimePAL = 20000; + Settings.FrameTimeNTSC = 16667; + Settings.Shutdown = Settings.ShutdownMaster = true; + Settings.DisableSampleCaching = false; + Settings.DisableMasterVolume = false; + Settings.Mouse = false; + Settings.SuperScope = false; + Settings.MultiPlayer5 = false; + Settings.ControllerOption = SNES_JOYPAD; +#ifdef USE_BLARGG_APU + Settings.SoundSync = true; +#endif + + Settings.ForceTransparency = false; + Settings.Transparency = true; + Settings.SixteenBit = true; + Settings.SupportHiRes = false; + Settings.AutoSaveDelay = 30; + Settings.ApplyCheats = true; + Settings.TurboMode = false; + Settings.TurboSkipFrames = 15; +#ifdef ASM_SPC700 + Settings.asmspc700 = true; +#endif + Settings.SpeedHacks = true; + Settings.HBlankStart = (256 * Settings.H_Max) / SNES_HCOUNTER_MAX; +} + +void Init_SFC(void) +{ + init_sfc_setting(); + MemoryInit(); + S9xInitAPU(); + S9xInitDisplay(NULL, NULL); + S9xGraphicsInit(); +#ifdef USE_BLARGG_APU + S9xInitSound(1000, 0); /* just give it a 1 second buffer */ + S9xSetSamplesAvailableCallback(S9xAudioCallback); +#else + S9xInitSound(); +#endif +} + +void Deinit_SFC(void) +{ +#ifdef USE_SPC7110 + if (Settings.SPC7110) + Del7110Gfx(); +#endif + + S9xGraphicsDeinit(); + S9xDeinitDisplay(); + S9xDeinitAPU(); + MemoryDeinit(); +} + + + +/* Main entrypoint of the emulator */ +int main(int argc, char* argv[]) +{ + int isloaded; + + printf("Starting Snes9x2002\n"); + + if (argc < 2) + { + printf("Specify a ROM to load in memory\n"); + return 0; + } + + snprintf(GameName_emu, sizeof(GameName_emu), "%s", basename(argv[1])); + Init_SFC(); + + Init_Video(); + Audio_Init(); + + overclock_cycles = false; + one_c = 4; + slow_one_c = 5; + two_c = 6; + reduce_sprite_flicker = false; + + isloaded = Load_Game_Memory(argv[1]); + if (!isloaded) + { + printf("Could not load ROM in memory\n"); + return 0; + } + + Init_Configuration(); + + // get the game ready + while (!exit_snes) + { + switch(emulator_state) + { + case 0: + Emulation_Run(); + break; + case 1: + Menu(); + break; + } + } + + Deinit_SFC(); + Audio_Close(); + Video_Close(); + + return 0; +} |